SOLUTION: Sean has taken three exams and earned scores of 85, 72, and 77 out of a possible 100 points. He needs an average of at least 80 to earn a B in the course. What range of scores on

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Question 946875: Sean has taken three exams and earned scores of 85, 72, and 77 out of a possible 100 points. He needs an average of at least 80 to earn a B in the course. What range of scores on the fourth (and last) 100 point test will guarantee a B in the course?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
I assume the range for B is [80,90)
80%3C=%2885%2B72%2B77%2BT%29%2F4%3C90
320%3C=234%2BT%3C360
86%3C=T%3C126
He needs at least an 86 to get a B.